MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 0.2

11/96

Advance Information

Low-Voltage CMOS 16-Bit

Transceiver/Registered

Transceiver

With 5V-Tolerant Inputs and Outputs

(3-State, Non-Inverting)

The MC74LCX16646 is a high performance, non–inverting 16–bit

transceiver/registered transceiver operating from a 2.7 to 3.6V supply.

The device is byte controlled. Each byte has separate control inputs

which can be tied together for full 16–bit operation. High impedance TTL

compatible inputs significantly reduce current loading to input drivers

while TTL compatible outputs offer improved switching noise

performance. A VI specification of 5.5V allows MC74LCX16646 inputs to

be safely driven from 5V devices. The MC74LCX16646 is suitable for

memory address driving and all TTL level bus oriented transceiver

applications.

Data on the A or B bus will be clocked into the registers as the

appropriate clock pin goes from a LOW–to–HIGH logic level. Output

Enable (OEn) and Direction Control (DIRn) pins are provided to control

the transceiver outputs. In the transceiver mode, data present at the high

impedance port may be stored in either the A or the B register or in both.

The select controls (SBAn, SABn) can multiplex stored and real–time

(transparent mode) data. The DIR determines which bus will receive data

when OE is active LOW. In the isolation mode (OE HIGH), A data may be

stored in the B register or B data may be stored in the A register. Only one

of the two buses, A or B, may be driven at one time.

Substantially Reduces System Power Requirements

This document contains information on a new product. Specifications and information herein are subject to

change without notice.

LOW–VOLTAGE CMOS

16–BIT TRANSCEIVER/

REGISTERED TRANSCEIVER

MC74LCX16646

DT SUFFIX

PLASTIC TSSOP PACKAGE

CASE 1202–01

PIN NAMES

Function

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Select Control Inputs

Output Enable Inputs

Pins

A0–A15

B0–B15

CABn, CBAn

SABn, SBAn

DIRn, OEn